src/mesa/state_tracker/st_draw.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 /*
  29  * This file implements the st_draw_vbo() function which is called from
  30  * Mesa's VBO module.  All point/line/triangle rendering is done through
  31  * this function whether the user called glBegin/End, glDrawArrays,
  32  * glDrawElements, glEvalMesh, or glCalList, etc.
  33  *
  34  * Authors:
  35  *   Keith Whitwell <keith@tungstengraphics.com>
  36  */
  37
  38
  39 #include "main/imports.h"
  40 #include "main/image.h"
  41 #include "main/bufferobj.h"
  42 #include "main/macros.h"
  43 #include "main/mfeatures.h"
  44
  45 #include "vbo/vbo.h"
  46
  47 #include "st_context.h"
  48 #include "st_atom.h"
  49 #include "st_cb_bufferobjects.h"
  50 #include "st_cb_xformfb.h"
  51 #include "st_debug.h"
  52 #include "st_draw.h"
  53 #include "st_program.h"
  54
  55 #include "pipe/p_context.h"
  56 #include "pipe/p_defines.h"
  57 #include "util/u_inlines.h"
  58 #include "util/u_format.h"
  59 #include "util/u_prim.h"
  60 #include "util/u_draw_quad.h"
  61 #include "util/u_upload_mgr.h"
  62 #include "draw/draw_context.h"
  63 #include "cso_cache/cso_context.h"
  64
  65 #include "../glsl/ir_uniform.h"
  66
  67
  68 /**
  69  * This is very similar to vbo_all_varyings_in_vbos() but we are
  70  * only interested in per-vertex data.  See bug 38626.
  71  */
  72 static GLboolean
  73 all_varyings_in_vbos(const struct gl_client_array *arrays[])
  74 {
  75    GLuint i;
  76
  77    for (i = 0; i < VERT_ATTRIB_MAX; i++)
  78       if (arrays[i]->StrideB &&
  79           !arrays[i]->InstanceDivisor &&
  80           !_mesa_is_bufferobj(arrays[i]->BufferObj))
  81          return GL_FALSE;
  82
  83    return GL_TRUE;
  84 }
  85
  86
  87 /**
  88  * Basically, translate Mesa's index buffer information into
  89  * a pipe_index_buffer object.
  90  * \return TRUE or FALSE for success/failure
  91  */
  92 static boolean
  93 setup_index_buffer(struct st_context *st,
  94                    const struct _mesa_index_buffer *ib,
  95                    struct pipe_index_buffer *ibuffer)
  96 {
  97    struct gl_buffer_object *bufobj = ib->obj;
  98
  99    ibuffer->index_size = vbo_sizeof_ib_type(ib->type);
 100
 101    /* get/create the index buffer object */
 102    if (_mesa_is_bufferobj(bufobj)) {
 103       /* indices are in a real VBO */
 104       ibuffer->buffer = st_buffer_object(bufobj)->buffer;
 105       ibuffer->offset = pointer_to_offset(ib->ptr);
 106    }
 107    else if (st->indexbuf_uploader) {
 108       if (u_upload_data(st->indexbuf_uploader, 0,
 109                         ib->count * ibuffer->index_size, ib->ptr,
 110                         &ibuffer->offset, &ibuffer->buffer) != PIPE_OK) {
 111          /* out of memory */
 112          return FALSE;
 113       }
 114       u_upload_unmap(st->indexbuf_uploader);
 115    }
 116    else {
 117       /* indices are in user space memory */
 118       ibuffer->user_buffer = ib->ptr;
 119    }
 120
 121    cso_set_index_buffer(st->cso_context, ibuffer);
 122    return TRUE;
 123 }
 124
 125
 126 /**
 127  * Prior to drawing, check that any uniforms referenced by the
 128  * current shader have been set.  If a uniform has not been set,
 129  * issue a warning.
 130  */
 131 static void
 132 check_uniforms(struct gl_context *ctx)
 133 {
 134    struct gl_shader_program *shProg[3] = {
 135       ctx->Shader.CurrentVertexProgram,
 136       ctx->Shader.CurrentGeometryProgram,
 137       ctx->Shader.CurrentFragmentProgram,
 138    };
 139    unsigned j;
 140
 141    for (j = 0; j < 3; j++) {
 142       unsigned i;
 143
 144       if (shProg[j] == NULL || !shProg[j]->LinkStatus)
 145          continue;
 146
 147       for (i = 0; i < shProg[j]->NumUserUniformStorage; i++) {
 148          const struct gl_uniform_storage *u = &shProg[j]->UniformStorage[i];
 149          if (!u->initialized) {
 150             _mesa_warning(ctx,
 151                           "Using shader with uninitialized uniform: %s",
 152                           u->name);
 153          }
 154       }
 155    }
 156 }
 157
 158
 159 /**
 160  * Translate OpenGL primtive type (GL_POINTS, GL_TRIANGLE_STRIP, etc) to
 161  * the corresponding Gallium type.
 162  */
 163 static unsigned
 164 translate_prim(const struct gl_context *ctx, unsigned prim)
 165 {
 166    /* GL prims should match Gallium prims, spot-check a few */
 167    STATIC_ASSERT(GL_POINTS == PIPE_PRIM_POINTS);
 168    STATIC_ASSERT(GL_QUADS == PIPE_PRIM_QUADS);
 169    STATIC_ASSERT(GL_TRIANGLE_STRIP_ADJACENCY == PIPE_PRIM_TRIANGLE_STRIP_ADJACENCY);
 170
 171    /* Avoid quadstrips if it's easy to do so:
 172     * Note: it's important to do the correct trimming if we change the
 173     * prim type!  We do that wherever this function is called.
 174     */
 175    if (prim == GL_QUAD_STRIP &&
 176        ctx->Light.ShadeModel != GL_FLAT &&
 177        ctx->Polygon.FrontMode == GL_FILL &&
 178        ctx->Polygon.BackMode == GL_FILL)
 179       prim = GL_TRIANGLE_STRIP;
 180
 181    return prim;
 182 }
 183
 184
 185 /**
 186  * This function gets plugged into the VBO module and is called when
 187  * we have something to render.
 188  * Basically, translate the information into the format expected by gallium.
 189  */
 190 void
 191 st_draw_vbo(struct gl_context *ctx,
 192             const struct _mesa_prim *prims,
 193             GLuint nr_prims,
 194             const struct _mesa_index_buffer *ib,
 195             GLboolean index_bounds_valid,
 196             GLuint min_index,
 197             GLuint max_index,
 198             struct gl_transform_feedback_object *tfb_vertcount)
 199 {
 200    struct st_context *st = st_context(ctx);
 201    struct pipe_index_buffer ibuffer = {0};
 202    struct pipe_draw_info info;
 203    const struct gl_client_array **arrays = ctx->Array._DrawArrays;
 204    unsigned i;
 205
 206    /* Mesa core state should have been validated already */
 207    assert(ctx->NewState == 0x0);
 208
 209    /* Validate state. */
 210    if (st->dirty.st || ctx->NewDriverState) {
 211       st_validate_state(st);
 212
 213       if (st->vertex_array_out_of_memory)
 214          return;
 215
 216 #if 0
 217       if (MESA_VERBOSE & VERBOSE_GLSL) {
 218          check_uniforms(ctx);
 219       }
 220 #else
 221       (void) check_uniforms;
 222 #endif
 223    }
 224
 225    util_draw_init_info(&info);
 226    if (ib) {
 227       /* Get index bounds for user buffers. */
 228       if (!index_bounds_valid)
 229          if (!all_varyings_in_vbos(arrays))
 230             vbo_get_minmax_indices(ctx, prims, ib, &min_index, &max_index,
 231                                    nr_prims);
 232
 233       if (!setup_index_buffer(st, ib, &ibuffer)) {
 234          /* out of memory */
 235          return;
 236       }
 237
 238       info.indexed = TRUE;
 239       if (min_index != ~0 && max_index != ~0) {
 240          info.min_index = min_index;
 241          info.max_index = max_index;
 242       }
 243
 244       /* The VBO module handles restart for the non-indexed GLDrawArrays
 245        * so we only set these fields for indexed drawing:
 246        */
 247       info.primitive_restart = ctx->Array._PrimitiveRestart;
 248       info.restart_index = ctx->Array._RestartIndex;
 249    }
 250    else {
 251       /* Transform feedback drawing is always non-indexed. */
 252       /* Set info.count_from_stream_output. */
 253       if (tfb_vertcount) {
 254          st_transform_feedback_draw_init(tfb_vertcount, &info);
 255       }
 256    }
 257
 258    /* do actual drawing */
 259    for (i = 0; i < nr_prims; i++) {
 260       info.mode = translate_prim( ctx, prims[i].mode );
 261       info.start = prims[i].start;
 262       info.count = prims[i].count;
 263       info.start_instance = prims[i].base_instance;
 264       info.instance_count = prims[i].num_instances;
 265       info.index_bias = prims[i].basevertex;
 266       if (!ib) {
 267          info.min_index = info.start;
 268          info.max_index = info.start + info.count - 1;
 269       }
 270
 271       if (ST_DEBUG & DEBUG_DRAW) {
 272          debug_printf("st/draw: mode %s  start %u  count %u  indexed %d\n",
 273                       u_prim_name(info.mode),
 274                       info.start,
 275                       info.count,
 276                       info.indexed);
 277       }
 278
 279       if (info.count_from_stream_output) {
 280          cso_draw_vbo(st->cso_context, &info);
 281       }
 282       else if (info.primitive_restart) {
 283          /* don't trim, restarts might be inside index list */
 284          cso_draw_vbo(st->cso_context, &info);
 285       }
 286       else if (u_trim_pipe_prim(info.mode, &info.count))
 287          cso_draw_vbo(st->cso_context, &info);
 288    }
 289
 290    if (ib && st->indexbuf_uploader && !_mesa_is_bufferobj(ib->obj)) {
 291       pipe_resource_reference(&ibuffer.buffer, NULL);
 292    }
 293 }
 294
 295
 296 void
 297 st_init_draw(struct st_context *st)
 298 {
 299    struct gl_context *ctx = st->ctx;
 300
 301    vbo_set_draw_func(ctx, st_draw_vbo);
 302
 303    st->draw = draw_create(st->pipe); /* for selection/feedback */
 304
 305    /* Disable draw options that might convert points/lines to tris, etc.
 306     * as that would foul-up feedback/selection mode.
 307     */
 308    draw_wide_line_threshold(st->draw, 1000.0f);
 309    draw_wide_point_threshold(st->draw, 1000.0f);
 310    draw_enable_line_stipple(st->draw, FALSE);
 311    draw_enable_point_sprites(st->draw, FALSE);
 312 }
 313
 314
 315 void
 316 st_destroy_draw(struct st_context *st)
 317 {
 318    draw_destroy(st->draw);
 319 }